Higgins, J. R. <br/><br/>
Completeness and basis properties of sets of special functions  

 - Cambridge [Eng.] ;;New York   Cambridge University Press,  1977 
<br/><br/><label>ISBN: </label>521213762 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Functions, Special.;Series, Orthogonal.;Lp spaces.
<br/><br/><label>Dewey Class. No.: </label>515.5 HIG